Question

在表单加载时，我试图查看我的应用程序是否可以连接到数据库。如果它没有连接我想显示一个带有好消息的消息框，并关闭应用程序。我遇到的问题是，当它试图关闭应用程序时，它会触及Form_closing事件，询问他们＆＃34;他们是否想要退出应用程序＆＃34;对于无权访问应用程序/数据库的用户来说，查看消息框看起来有点奇怪。我只是想跳过表格结束活动，只是关闭表格，任何帮助将不胜感激。

  private void Form1_Load(object sender, EventArgs e)
  {
     checkcon();
  }
  private void checkcon()
  {
     try
     {
       MSSQL.SqlConnection con = new MSSQL.SqlConnection(constr);
       con.Open();
       con.Close();
     }
     catch (Exception ex)
     {
       MessageBox.Show("Your domain account does not have sufficient privilages to    continue with the application please contact the IS support Team.");              
       Close();
     }

  }

  private void Form1_FormClosing(object sender, FormClosingEventArgs e)
  {
    DialogResult result = MessageBox.Show("Are you sure you want to exit the application?", "Alert", MessageBoxButtons.YesNo, MessageBoxIcon.Warning);
     if (result == DialogResult.No)
     {
        e.Cancel = true;
     }
     else
     {
     }
  }

Answer 1

添加一个静态bool var作为检查是否显示Dialogue：

 public static bool HasPermission=true;
 private void checkcon()
  {
     try
     {
       MSSQL.SqlConnection con = new MSSQL.SqlConnection(constr);
       con.Open();

       con.Close();
     }
     catch (Exception ex)
     { 
       HasPermission=false;
       MessageBox.Show("Your domain account does not have sufficient privilages to    continue with the application please contact the IS support Team.");              
       Close();
     }

  }

 private void Form1_FormClosing(object sender, FormClosingEventArgs e)
  { if (HasPermission)
    {
    DialogResult result = MessageBox.Show("Are you sure you want to exit the application?", "Alert", MessageBoxButtons.YesNo, MessageBoxIcon.Warning);
     if (result == DialogResult.No)
     {
        e.Cancel = true;
     }
     else
     {
     }
     }
  }

Answer 2

我认为这很容易。

只需创建boolean类型的变量并检查用户是否可以访问数据库？如果没有，请在没有任何确认的情况下关闭它。

让我通过修改你的代码来解释你：

  bool userGotPermissionToYourApplication = true;

  private void Form1_Load(object sender, EventArgs e)
  {
     checkcon();
  }
  private void checkcon()
  {
     try
     {
       MSSQL.SqlConnection con = new MSSQL.SqlConnection(constr);
       con.Open();
       con.Close();

     }
     catch (Exception ex)
     {
       MessageBox.Show("Your domain account does not have sufficient privilages to    continue with the application please contact the IS support Team.");              
       userGotPermissionToYourApplication = false;
       Close();
     }

  }

  private void Form1_FormClosing(object sender, FormClosingEventArgs e)
  {
    if(userGotPermissionToYourApplication)
    {
        DialogResult result = MessageBox.Show("Are you sure you want to exit the application?", "Alert", MessageBoxButtons.YesNo, MessageBoxIcon.Warning);
        if (result == DialogResult.No)
        {
            e.Cancel = true;
        }
        else
        {
        }
    }
}

关闭我的应用程序会干扰我的Form1_FormClosing事件

2 个答案: